The relationship between lunar halo and moonlight and the weather and the weather changes that will happen.

Halo-also known as "wind circle", the moonlight is refracted by clouds, forming an aperture around the moon, which can be used as a sign of weather change: the moon has a strong halo wind and the foundation is wet and rainy.

Before the weather changes, we sometimes see one or more colored or white apertures around the sun or the moon, and the sunlight and the moon light seem to be much darker.

We call this aperture around the sun or moon "halo". The aperture around the sun is called "solar halo" and the aperture around the moon is called "lunar halo". This is a strange meteorological phenomenon. The color of halo is generally infrared violet.

Halo-the phenomenon that light is refracted by moonlight when it passes through ice crystals in clouds. The color is dizzy, and the interior is infrared purple.

The appearance of solar halo or lunar halo often indicates that the weather will change to a certain extent. Generally speaking, a solar halo means it may rain, while more lunar halos mean it will be windy. So there is a folk proverb: "The sun is dizzy in the middle of the night and the moon is dizzy at noon."

Yuet-the blue-green flowers inside Yuet and the reddish-brown flowers outside Yuet are diffraction phenomena. When light passes through small water droplets with similar wavelengths, the light intensity will be distributed alternately. This is diffraction. If the outer ring is only white, it is that the halo is caused by light passing through cirrostratus, and it may rain.